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RF Characterization of 3-D-Printed Tunable Resonators on a Composite Substrate Infused With Magnetic Nanoparticles
Journal article

RF Characterization of 3-D-Printed Tunable Resonators on a Composite Substrate Infused With Magnetic Nanoparticles

Yaaqoub Malallah, Khaled Alhassoon, Gurveer Bhuta and Afshin S. Daryoush
IEEE microwave and wireless components letters, v 32(10), pp 1-4
25 May 2022

Abstract

Additive manufacturing annular ring resonator cobalt ferrite nanoparticles electromagnetic extraction finite element method (FEM) Magnetic domains Magnetic resonance Printing Programmable logic arrays Radio frequency Substrates Tuning
Three-dimensional additive manufacturing methods are being continuously improved with great interest in low cost and small size radio frequency (RF) circuits. Recent developments in magnetically tunable microwave/RF components are attractive for externally controlled circuits without influencing RF characteristics. This letter focuses on additive manufacturing of ferroic nanomaterials along with their implementation in frequency-tuned RF circuits using an applied magnetic field. Extraction of the additively manufactured magneto-dielectric composite was performed at S-band frequencies using least squares curve fitting of measured and simulated S-parameters for annular ring resonator modes. Polylactide (PLA) material used for additive manufacturing was extracted to have ϵ = 1.80 - j0.031. Meanwhile, magnetic CoFe₂O₄ with 45-nm average nanoparticles size was extracted to have ϵ = 3.10 - j0.084 and μ = 1.70 - j0.145; while Protopasta's magnetic filament had ϵ = 1.80 - j0.031 and μ = 2.19 - j0.569. The 3-D printed magnetic composite is used to design tunable annular ring resonators at 2.4 GHz with up to 38-MHz frequency tuning for an applied 1-kG magnetic field.

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Engineering, Electrical & Electronic
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